SL1 4 postcode sector in the SL1 district

SL1 4 is a sector of the SL1 district: every postcode that starts SL1 4. It has 98 postcodes in use, 8 of them large-user postcodes. A large-user postcode is one Royal Mail gives to a single address that gets a lot of mail.

Not sure what a sector is? UK postcode format explained.

Every postcode in the SL1 4 sector, and which are new since 2020

Map of every postcode in the SL1 4 sector, by new since 2020 Of the 98 postcodes in the SL1 4 sector that ONS places, 3 are new since 2020 and 95 were in use before 2020. Places named: Slough. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 500 m. SL1 4AA: before 2020SL1 4AG: before 2020SL1 4AN: before 2020SL1 4AQ: before 2020SL1 4AX: before 2020SL1 4AY: before 2020SL1 4BD: before 2020SL1 4BE: before 2020SL1 4BG: before 2020SL1 4BH: before 2020SL1 4DE: before 2020SL1 4DX: before 2020SL1 4ED: before 2020SL1 4EH: before 2020SL1 4EP: before 2020SL1 4EQ: before 2020SL1 4EU: before 2020SL1 4FN: before 2020SL1 4HA: before 2020SL1 4HB: before 2020SL1 4HE: before 2020SL1 4HF: before 2020SL1 4HG: before 2020SL1 4HL: before 2020SL1 4HR: before 2020SL1 4HY: before 2020SL1 4JA: before 2020SL1 4JB: before 2020SL1 4JG: before 2020SL1 4JU: before 2020SL1 4JW: before 2020SL1 4LA: before 2020SL1 4LG: before 2020SL1 4LH: before 2020SL1 4LN: before 2020SL1 4LP: before 2020SL1 4LR: before 2020SL1 4LU: before 2020SL1 4LZ: before 2020SL1 4NB: before 2020SL1 4NH: before 2020SL1 4NJ: before 2020SL1 4NL: before 2020SL1 4NN: before 2020SL1 4PF: before 2020SL1 4PG: before 2020SL1 4PH: before 2020SL1 4PJ: before 2020SL1 4PL: before 2020SL1 4PN: before 2020SL1 4PY: before 2020SL1 4QA: before 2020SL1 4QT: before 2020SL1 4QU: before 2020SL1 4QZ: before 2020SL1 4RA: before 2020SL1 4RD: before 2020SL1 4RF: before 2020SL1 4RY: before 2020SL1 4SH: before 2020SL1 4SP: before 2020SL1 4SS: before 2020SL1 4ST: before 2020SL1 4SZ: before 2020SL1 4TJ: before 2020SL1 4TN: before 2020SL1 4TQ: before 2020SL1 4TT: before 2020SL1 4TU: before 2020SL1 4UE: before 2020SL1 4UF: before 2020SL1 4UN: before 2020SL1 4UT: before 2020SL1 4WS: before 2020SL1 4XA: before 2020SL1 4XB: before 2020SL1 4XE: before 2020SL1 4XL: before 2020SL1 4XN: before 2020SL1 4XP: before 2020SL1 4XQ: before 2020SL1 4XS: before 2020SL1 4XT: before 2020SL1 4XU: before 2020SL1 4XX: before 2020SL1 4XZ: before 2020SL1 4YA: before 2020SL1 4EL: new since 2020SL1 4ES: new since 2020SL1 4ET: new since 2020 Slough Map of every postcode in the SL1 4 sector, by new since 2020 Of the 98 postcodes in the SL1 4 sector that ONS places, 3 are new since 2020 and 95 were in use before 2020. Places named: Slough. Drawn over roads, rivers and built-up areas. North is up; the scale bar is 1 km. M4 Slough
  • New since 2020: 3
  • In use before 2020: 95

Of the 98 postcodes in the SL1 4 sector that ONS places, 3 are new since 2020 and 95 were in use before 2020.

Each mark is a postcode's centre point as ONS gives it, not a building. Press one to see its postcode and open its page. New since 2020 means it came into use in January 2020 or later. No boundary is drawn. Where marks overlap, the one first in the key is drawn; the counts include every postcode.

Source: Office for National Statistics (ONS) Postcode Directory, August 2026, loaded 20 October 2026, the centre point of each postcode; when each came into use: the same directory; roads, rivers and built-up areas: Contains OS data © Crown copyright and database right 2026. Drawn by us. Street map: Ordnance Survey, OS Open Zoomstack, Open Government Licence v3.0, drawn with MapLibre. How we use them

The 3 newest postcodes

SL1 4ETFebruary 2026SL1 4ESJanuary 2024SL1 4ELApril 2021

What do homes sell for in SL1 4?

HM Land Registry records one sale of homes in SL1 4 in the 12 months to August 2026: too few to give a typical price.

  • Terraced 1 sale, too few to price

Standard sales of homes at market value at the postcodes that start SL1 4. A typical price is the median, the middle sale, given from 5 sales or more.

How we work this out: house prices by postcode

Source: HM Land Registry Price Paid Data, files dated 28 September 2026. Contains HM Land Registry data © Crown copyright and database right 2021. This data is licensed under the Open Government Licence v3.0. How we use it

Postcodes in SL1 4

Pick a postcode to see its council and MP, broadband, flood risk, what homes sell for, council tax, the nearest schools and stations, and crime around it.

SL1 4AASL1 4AGSL1 4ANSL1 4AQSL1 4AXSL1 4AYSL1 4BDSL1 4BESL1 4BFSL1 4BGSL1 4BHSL1 4DESL1 4DGSL1 4DXSL1 4EDSL1 4EHSL1 4ELSL1 4EPSL1 4EQSL1 4ESSL1 4ETSL1 4EUSL1 4FNSL1 4FWSL1 4HASL1 4HBSL1 4HESL1 4HFSL1 4HGSL1 4HLSL1 4HRSL1 4HYSL1 4JASL1 4JBSL1 4JGSL1 4JUSL1 4JWSL1 4LASL1 4LGSL1 4LHSL1 4LNSL1 4LPSL1 4LRSL1 4LUSL1 4LZSL1 4NBSL1 4NHSL1 4NJSL1 4NLSL1 4NNSL1 4PFSL1 4PGSL1 4PHSL1 4PJSL1 4PLSL1 4PNSL1 4PYSL1 4QASL1 4QTSL1 4QUSL1 4QZSL1 4RASL1 4RDSL1 4RFSL1 4RYSL1 4SGSL1 4SHSL1 4SPSL1 4SSSL1 4STSL1 4SZSL1 4TJSL1 4TNSL1 4TQSL1 4TTSL1 4TUSL1 4UESL1 4UFSL1 4UNSL1 4UTSL1 4WASL1 4WESL1 4WSSL1 4XASL1 4XBSL1 4XESL1 4XLSL1 4XNSL1 4XPSL1 4XQSL1 4XSSL1 4XTSL1 4XUSL1 4XXSL1 4XYSL1 4XZSL1 4YASL1 4ZA

Source: Office for National Statistics (ONS) Postcode Directory, August 2026, loaded 20 October 2026. Postcodes that have ended are not listed. See all our data sources

What council am I in? The council, borough or local authority for a postcode, and the county council where there is one. What ward am I in? The ward for a postcode, with its council, constituency and parish.

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